To prepare for this set's release, the second half of EB-04's cards are included
The opponent that controls three or more creatures as the ability resolves doesn't have to be the same opponent that controlled three or more creatures as it triggered
Celebrations, released in October 2021, shrank packs to four cards but made every one of them foil, and introduced the idea that defines anniversary sets today: a Classic Collection of 25 reprinted icons, each carrying a 25th anniversary stamp and etched foil, with the Base Set Charizard as the chase
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Since this effect fulfills a similar role to a common piece of interaction that Lab already homes, Daruma Cannon, you can use Silvera in a lot of the similar spots you would otherwise Daruma and save your Cannon for further in the turn if your opponent really pushes that far, making for a nice perk in terms of resource management